RFR: 8337563: NMT: rename MEMFLAGS to MemFlag

[Kim Barrett]

On Thu, 15 Aug 2024 07:46:34 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> > > Whatever we choose we also need to consider the mt prefix of things like mtGC, mtClass, etc.
> > 
> > 
> > And what does that stand for: memory type? memory tracker? Arguably they should have been nmtGC etc.
> 
> The memflags.hpp file says that it's a memory type:
> 
> ```
> +#define MEMORY_TYPES_DO(f)                                                           \
> +  /* Memory type by sub systems. It occupies lower byte. */                          \
> +  f(mtJavaHeap,       "Java Heap")   /* Java heap                                 */ \
> ```
> 
> My guess is that at some point there was an incomplete rename from "memory type".

Note that we used to have `typedef MemType MEMFLAGS;`

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PR Comment: https://git.openjdk.org/jdk/pull/20497#issuecomment-2290846873